Good online multiplayer games

I've been innovating a handful maps at the cool universe <a href="http://www.roblox.com/User.aspx?ID=8350982&userid=8350982&rbx_source=ambassador&rbx_medium=Direct&rbx_campaign=ambpro">ROBLOX</a>

edit by 2797jake
i think minecraft is a amazing game, it may sound syupid but it is so much fun try it out